As tapping machines Roscamat are offered in several different models. The scope of application for the different machines is also reflected in the different range of tapping sizes, here from M2 to M12 for the smallest machines for tapping of threads in thin sheets, down to M24 and beyond for the larger machines for tapping of coarse threads in larger structural components.
Entry-Level Models: M2 to M12
Small tapping tasks in thin sheet metal, aluminium or light steel with fine threads (M2 – M12) are best done with a small Roscamat tapping machine like our 50W or 100W model. These machines are designed for precise work and have a high torque for their size but do not allow for too much force on the tap. This prevents damage to the threads or to the surrounding material.
Mid-Range Machines: Up to M24
The medium machines are designed for work with structural steel, cast iron and larger sections, up to M24 and more. These machines are smaller than the larger tapping machines, but have a lot of power to tap fine threads in larger sections. As with the larger tapping machines, the speed of the spindle is lower for larger diameters. The coarser thread requires slower rotation and more torque to cut the fine details of the thread.
How Speed and Torque Relate to Size
The larger the diameter of the tap, the slower the spindle speed must be. A typical arm of a Roscamat can be equipped with a number of different spindle speeds. For the larger taps the lowest spindle speed is typically around 300 rpm. However, if this is then applied to hard steel at high pressure, the tap is likely to break.
Material Affects Usable Range
The capacity of a tapping machine must be compared to the actual work material. Therefore a machine that is rated for tapping up to M24 threads may be limited to M20 threads in very hard steel. Stainless steel is particularly difficult to tap. The thread dimensions are according to ISO for metric threads. In addition to the actual tapping machine the thread form and the clearance hole must also be according to the respective ISO standard.
Matching Machine to Job
A knowledge of the largest diameter tap that you require on a regular basis and the material that you are to be tapping will give you an idea of which machine will be required to carry out the task efficiently.
If you are looking for Roscamat Tapping Machines, see //www.cotswold-machinery-sales.co.uk/roscamat-tapping-machines.
Getting the size range right for your needs before you start will save a lot of headaches in the long run.
